In Pok�mon Platinum - Valor Lakefront?

I've found the womans suite key and she's given me the cookie, but when I try to go into the restaurant they say they're closed? And there's no Team Galactic thug? And I don't have rock smash, but it seems really far away to get it and I don't know how to get there? I've looked at other walkthroughs on the internet and their restaurants aren't closed.